Type I band alignment in GaAs 81 Sb 19 /GaAs core-shell nanowires - Archive ouverte HAL Access content directly
Journal Articles Applied Physics Letters Year : 2015

Type I band alignment in GaAs 81 Sb 19 /GaAs core-shell nanowires

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Tao Xu
  • Function : Author
Mengjie Wei
  • Function : Author
Adrian Díaz Álvarez
  • Function : Author
Xiang-Lei Han
  • Function : Author
  • PersonId : 947922
Jean-Philippe Nys
  • Function : Author
Philipp Ebert
  • Function : Author

Abstract

The composition and band gap of the shell that formed during the growth of axial GaAs/GaAs81Sb19/ GaAs heterostructure nanowires have been investigated by transmission electron microscopy combined with energy dispersion spectroscopy, scanning tunneling spectroscopy, and density functional theory calculations. On the GaAs81Sb19 intermediate segment, the shell is found to be free of Sb (pure GaAs shell) and transparent to the tunneling electrons, despite the (110) biaxial strain that affects its band gap. As a result, a direct measurement of the core band gap allows the quantitative determination of the band offset between the GaAs81Sb19 core and the GaAs shell and identifies it as a type I band alignment.
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Dates and versions

hal-01713079 , version 1 (27-05-2022)

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Tao Xu, Mengjie Wei, Pierre Capiod, Adrian Díaz Álvarez, Xiang-Lei Han, et al.. Type I band alignment in GaAs 81 Sb 19 /GaAs core-shell nanowires. Applied Physics Letters, 2015, 107 (11), pp.112102. ⟨10.1063/1.4930991⟩. ⟨hal-01713079⟩
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